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https://github.com/Atmosphere-NX/Atmosphere.git
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96f95b9f95
* result: try out some experimental shenanigans * result: sketch out some more shenanigans * result: see what it looks like to convert kernel to use result conds instead of guards * make rest of kernel use experimental new macro-ing
160 lines
5.5 KiB
C++
160 lines
5.5 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mesosphere.hpp>
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namespace ams::kern {
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Result KCodeMemory::Initialize(KProcessAddress addr, size_t size) {
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MESOSPHERE_ASSERT_THIS();
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/* Set members. */
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m_owner = GetCurrentProcessPointer();
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/* Get the owner page table. */
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auto &page_table = m_owner->GetPageTable();
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/* Construct the page group, guarding to make sure our state is valid on exit. */
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auto pg_guard = util::ConstructAtGuarded(m_page_group, page_table.GetBlockInfoManager());
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/* Lock the memory. */
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R_TRY(page_table.LockForCodeMemory(GetPointer(m_page_group), addr, size));
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/* Clear the memory. */
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for (const auto &block : GetReference(m_page_group)) {
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/* Clear and store cache. */
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void * const block_address = GetVoidPointer(KMemoryLayout::GetLinearVirtualAddress(block.GetAddress()));
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std::memset(block_address, 0xFF, block.GetSize());
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cpu::StoreDataCache(block_address, block.GetSize());
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}
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/* Set remaining tracking members. */
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m_owner->Open();
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m_address = addr;
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m_is_initialized = true;
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m_is_owner_mapped = false;
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m_is_mapped = false;
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/* We succeeded. */
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pg_guard.Cancel();
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R_SUCCEED();
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}
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void KCodeMemory::Finalize() {
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MESOSPHERE_ASSERT_THIS();
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/* Unlock. */
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if (!m_is_mapped && !m_is_owner_mapped) {
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const size_t size = GetReference(m_page_group).GetNumPages() * PageSize;
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MESOSPHERE_R_ABORT_UNLESS(m_owner->GetPageTable().UnlockForCodeMemory(m_address, size, GetReference(m_page_group)));
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}
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/* Close the page group. */
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GetReference(m_page_group).Close();
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GetReference(m_page_group).Finalize();
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/* Close our reference to our owner. */
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m_owner->Close();
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}
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Result KCodeMemory::Map(KProcessAddress address, size_t size) {
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MESOSPHERE_ASSERT_THIS();
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/* Validate the size. */
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R_UNLESS(GetReference(m_page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Lock ourselves. */
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KScopedLightLock lk(m_lock);
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/* Ensure we're not already mapped. */
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R_UNLESS(!m_is_mapped, svc::ResultInvalidState());
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/* Map the memory. */
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R_TRY(GetCurrentProcess().GetPageTable().MapPageGroup(address, GetReference(m_page_group), KMemoryState_CodeOut, KMemoryPermission_UserReadWrite));
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/* Mark ourselves as mapped. */
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m_is_mapped = true;
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R_SUCCEED();
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}
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Result KCodeMemory::Unmap(KProcessAddress address, size_t size) {
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MESOSPHERE_ASSERT_THIS();
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/* Validate the size. */
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R_UNLESS(GetReference(m_page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Lock ourselves. */
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KScopedLightLock lk(m_lock);
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/* Unmap the memory. */
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R_TRY(GetCurrentProcess().GetPageTable().UnmapPageGroup(address, GetReference(m_page_group), KMemoryState_CodeOut));
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/* Mark ourselves as unmapped. */
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MESOSPHERE_ASSERT(m_is_mapped);
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m_is_mapped = false;
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R_SUCCEED();
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}
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Result KCodeMemory::MapToOwner(KProcessAddress address, size_t size, ams::svc::MemoryPermission perm) {
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MESOSPHERE_ASSERT_THIS();
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/* Validate the size. */
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R_UNLESS(GetReference(m_page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Lock ourselves. */
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KScopedLightLock lk(m_lock);
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/* Ensure we're not already mapped. */
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R_UNLESS(!m_is_owner_mapped, svc::ResultInvalidState());
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/* Convert the memory permission. */
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KMemoryPermission k_perm;
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switch (perm) {
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case ams::svc::MemoryPermission_Read: k_perm = KMemoryPermission_UserRead; break;
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case ams::svc::MemoryPermission_ReadExecute: k_perm = KMemoryPermission_UserReadExecute; break;
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MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
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}
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/* Map the memory. */
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R_TRY(m_owner->GetPageTable().MapPageGroup(address, GetReference(m_page_group), KMemoryState_GeneratedCode, k_perm));
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/* Mark ourselves as mapped. */
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m_is_owner_mapped = true;
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R_SUCCEED();
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}
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Result KCodeMemory::UnmapFromOwner(KProcessAddress address, size_t size) {
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MESOSPHERE_ASSERT_THIS();
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/* Validate the size. */
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R_UNLESS(GetReference(m_page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Lock ourselves. */
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KScopedLightLock lk(m_lock);
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/* Unmap the memory. */
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R_TRY(m_owner->GetPageTable().UnmapPageGroup(address, GetReference(m_page_group), KMemoryState_GeneratedCode));
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/* Mark ourselves as unmapped. */
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MESOSPHERE_ASSERT(m_is_owner_mapped);
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m_is_owner_mapped = false;
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R_SUCCEED();
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}
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}
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